In terms of the character itself, I can't really say that I find anything really difficult. I enjoy the character so much I don't perceive difficulty in trying to be him. It's just a matter of how do we get there. ↗
Each simian had a much different body suit, so besides trying to define class across species, there was a definite attempt to dress each group in different styles. ↗
I'd been trying for a while to get parts that weren't just the English bad guy, so it was quite refreshing to be playing someone who was a compassionate, decent guy. ↗